package com.scs.application.interceptor;

import com.alibaba.fastjson.JSONObject;

import javax.servlet.ReadListener;
import javax.servlet.ServletInputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletRequestWrapper;
import java.io.*;
import java.util.Enumeration;

/**
 */
public class RequestWrapper extends HttpServletRequestWrapper {
    /**请求参数
     * json对象
    */
    private final String body;

    public RequestWrapper(HttpServletRequest request) {
        super(request);
        String method = request.getMethod().toLowerCase();
        if (method.equals("post") || method.equals("delete")) { //post请求
            StringBuilder stringBuilder = new StringBuilder();
            BufferedReader bufferedReader = null;
            InputStream inputStream = null;
            try {
                inputStream = request.getInputStream();
                if (inputStream != null) {
                    bufferedReader = new BufferedReader(new InputStreamReader(inputStream));
                    char[] charBuffer = new char[128];
                    int bytesRead = -1;
                    while ((bytesRead = bufferedReader.read(charBuffer)) > 0) {
                        stringBuilder.append(charBuffer, 0, bytesRead);
                    }
                } else {
                    stringBuilder.append("");
                }
            } catch (IOException ex) {

            } finally {
                if (inputStream != null) {
                    try {
                        inputStream.close();
                    }
                    catch (IOException e) {
                        e.printStackTrace();
                    }
                }
                if (bufferedReader != null) {
                    try {
                        bufferedReader.close();
                    }
                    catch (IOException e) {
                        e.printStackTrace();
                    }
                }
            }
            body = stringBuilder.toString();
        }else { //其他请求，先统一作为get处理，后续有区别再细化
            Enumeration names = request.getParameterNames();
            JSONObject jsonObject = new JSONObject();
            String name,value;

            while(names.hasMoreElements()){
                 name = (String) names.nextElement();
                 value = request.getParameter(name);
                jsonObject.put(name,value);
            }
            body = jsonObject.toJSONString();
        }

    }

    @Override
    public ServletInputStream getInputStream() throws IOException {
        final ByteArrayInputStream byteArrayInputStream = new ByteArrayInputStream(body.getBytes());
        ServletInputStream servletInputStream = new ServletInputStream() {
            @Override
            public boolean isFinished() {
                return false;
            }
            @Override
            public boolean isReady() {
                return false;
            }
            @Override
            public void setReadListener(ReadListener readListener) {
            }
            @Override
            public int read() throws IOException {
                return byteArrayInputStream.read();
            }
        };
        return servletInputStream;

    }

    @Override
    public BufferedReader getReader() throws IOException {
        return new BufferedReader(new InputStreamReader(this.getInputStream()));
    }

    public String getBody() {
        return this.body;
    }
}
